I smoke salmon (and cheese and meats and potatoes) and smoked canned stuff tastes weird to me. That said, kippers and eggs for breaky are very nice. I prefer my salmon cold smoked, I mean just barely cooked. My brine is simple. I smoke with a mix of alder and apple mash pellets.
I eat canned sardines from time to time.
I use canned and jarred anchovies in cooking and on pizza.
I will eat canned tuna as well, but I just bought a whole fresh albacore, $3 /lb!! Barely cook it, chill, flake, serve over chilled cannelli white beans, sprinkle with chopped parsley, a little salt, finely chopped fresh garlic if you like, and drizzle with EVOO and fresh lemon/lime. OOOOH THAT IS GOOD for a cool dinner on a warm night.